New member here. I was given a Gamo Socom Tactical. Its my first springer and I've been shooting an 880 Daisy with $28 Barska scope. (6500 pellets) Ive been pleased with that setup, but am excited to explore this springer. It's missing the front sight but the rear sight is wobbly like it is not tight. Their is a torx screw that secure's it, but a T15 nor a T20 bit will fit. It's this proprietary to gamo? Do I need one of their wrenches or is it maybe a T17? I have read all official Torx only come in multiples of 5. Please help. I believe I've come to the right community for help. Happy to be here.